<template>
  <div>
    <router-link tag="div" to="/" class="header-abs" v-show="showAbs">
      <div class="iconfont header-abs-back">&#xe624;</div>
    </router-link>
    <div class="header-fixed" v-show="!showAbs" :style="opacityStyle">
        <router-link to="/">
            <div class="iconfont header-fixed-back">&#xe624;</div>
        </router-link>景点详情
    </div>
  </div>
</template>
<script>
export default {
  name: "DetailHeader",
  data () {
      return {
          showAbs :true,
          opacityStyle:{
              opacity:0
          }
      }
  },
  methods:{
      handleScroll () {
          const top = document.documentElement.scrollTop
          if (top > 60) {
              let opacity = top / 140
              opacity = opacity > 1 ? 1 :opacity
              this.opacityStyle = {
                  opacity
              }
              this.showAbs = false
          } else{
              this.showAbs = true
          }
      }
  },
  activated () {
      window.addEventListener(scroll,this.handleScroll)
  },
  deactivated () {
      window.removeEventListener(scroll,this.handleScroll)
  }
};
</script>
<style lang="stylus" scoped>
@import '~styles/varibles.styl';
.header-abs {
  position: absolute;
  top: 0.2rem;
  left: 0.2rem;
  width: 0.8rem;
  height: 0.8rem;
  line-height: 0.8rem;
  border-radius: 0.4rem;
  text-align: center;
  background: rgba(0, 0, 0, 0.8);
  .header-abs-back {
    color: #fff;
    font-size: 0.4rem;
  }
}
.header-fixed {
  z-index:2
  position: fixed;
  top:0
  left:0
  right:0
  overflow: hidden;
  height: $headerHeight;
  line-height: $headerHeight;
  text-align: center;
  color: #fff;
  background: $bgColor;
  font-size: 0.32rem;
  .header-fixedback {
    position: absolute;
    top: 0;
    left: 0;
    width: 0.64rem;
    text-align: center;
    font-size: 0.32rem;
    color: #fff;
  }
}
</style>





